SAFETY ALERTS RISK GALLERY WHAT IS SILO PROTECTION? SHIELD SPS SILO SERVICING CONTACT

SILO PROTECTION SAFETY ALERTS


SAFETY BRIEFING 1: Pressure relief valve near miss event

Ready mix, concrete and block works have silos on site that are pneumatically filled from road tankers. Many of the sites have silos fitted with pressure relief valves as their only protection from over-pressure.

The photographs show how they can be rendered completely ineffective by constant use and poor maintenance. Pressure relief valves are continuously relieving pressure without the reason being investigated or the cause eliminated. The road tankers are capable of blowing product into the silos at pressures as high as 2.0 bar.

The silo, however, is not a certified pressure vessel and is at risk of rupture at any pressure above 1psi. The lack of an effective silo protection system that provides automatic closure of the delivery valve, has resulted in silos being ruptured and filter systems being ejected from the silo roof.

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SAFETY BRIEFING 2: Neglecting maintenance of silo protection equipment can be dangerous

On ready mix, concrete and block plants, where silos are pneumatically filled from road tankers, it has been identified that there is serious danger of silo ruptures or filters blowing off – even with the correct MPA-recommended safety equipment installed.

Not only does this pose a direct risk, but the risk from working at height adds to the problem.


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SAFETY BRIEFING 3: Blocked filters can go undetected without a structured maintenance programme in place

During tanker delivery procedures at a UK concrete block plant, drivers were recording multiple high pressure events and safety shutdowns. The silo protection equipment was passing pre-delivery tests and the air venting filter unit had recently been serviced. Hycontrol engineers were asked to investigate why the pressure alarm was triggering with such regularity.

Their investigation highlighted a problem with one of the solenoids controlling airflow to the reverse jet cleaning nozzles, resulting in serious blockages on three of the seven filter cartridges.

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